use count=0 instead of 1 for recursive mutex with only one lock reference

[musl] / src / thread / pthread_mutex_unlock.c

diff --git a/src/thread/pthread_mutex_unlock.c b/src/thread/pthread_mutex_unlock.c
index 0f4a5e6..05baec1 100644 (file)
--- a/src/thread/pthread_mutex_unlock.c
+++ b/src/thread/pthread_mutex_unlock.c
@@ -12,8 +12,8 @@ int pthread_mutex_unlock(pthread_mutex_t *m)
                self = __pthread_self();
                if ((m->_m_lock&0x1fffffff) != self->tid)
                        return EPERM;
-               if ((m->_m_type&3) == PTHREAD_MUTEX_RECURSIVE && --m->_m_count)
-                       return 0;
+               if ((m->_m_type&3) == PTHREAD_MUTEX_RECURSIVE && m->_m_count)
+                       return m->_m_count--, 0;
                if (m->_m_type >= 4) {
                        self->robust_list.pending = &m->_m_next;
                        *(void **)m->_m_prev = m->_m_next;